Question

Which of these is the equation for a circle with a radius of 10 and a center at (11, -2)?
a.(x + 11)2 – (y – 2)2 = 100
b.(x + 11)2 + (y – 2)2 = 100
c.(x – 11)2 – (y + 2)2 = 100
d.(x – 11)2 + (y + 2)2 = 100

Answer 1

i believe c

Answer 2

the signs are flipped

Answer 3

What do you mean signs are flipped?

Answer 4

notice that 11,-2 and that corresponds to x,y

.(x – 11)2 – (y + 2)2 = 100

^ flipped
^flipped

the formula is

(x - h)2 + (y-k)2 = r2
^ forgot about the plus
it's D actually

Answer 5

x,y is h,k

Answer 6

awesome :) thank you

Answer 7

(x - h)2 + (y-k)2 = r2
^ whatever x coordinate of origin you are given here. But with flipped sign
^ same here but for y coordinate
^ here you square whatever radius they gave you.